System and method for arbitrary phase and amplitude modulation in an antenna
First Claim
1. A direct spatial antenna modulation (DSAM) system comprising:
- a radiating structure comprising a plurality of spatial points of origination; and
a control system, wherein the control system is connected to the radiating structure via N spatial points of origination, wherein N is equal to or greater than 2, and wherein the control system is configured to perform operations comprising;
receiving an unmodulated carrier and a baseband data signal;
splitting the unmodulated carrier into N signals;
adjusting an amplitude of each of the N signals in response to the baseband signal;
assigning a spatial point of origination to each of the N signals; and
simultaneously applying each of the N signals to the assigned spatial point of origination to emit from the radiating structure a radio frequency signal having one of M modulation states, where M is greater than N.
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Abstract
A system and method for arbitrarily switching phase and amplitude at an antenna. A Direct Spatial Antenna Modulation (DSAM) system makes use of the spatial characteristics of a radiating antenna structure to directly alter a signal transmitted or received by the radiating structure. A data stream maps a carrier to different spatial points of excitation in the antenna structure, where each chosen configuration has different radiating characteristics including phase, amplitude, and polarization, which can be used represent data symbols. The spatial points of a radiating structure may be mapped directly to In-Phase and Quadrature components of the output using two spatial feedpoints and amplitude control to the feedpoints. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this Abstract.
32 Citations
18 Claims
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1. A direct spatial antenna modulation (DSAM) system comprising:
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a radiating structure comprising a plurality of spatial points of origination; and a control system, wherein the control system is connected to the radiating structure via N spatial points of origination, wherein N is equal to or greater than 2, and wherein the control system is configured to perform operations comprising; receiving an unmodulated carrier and a baseband data signal; splitting the unmodulated carrier into N signals; adjusting an amplitude of each of the N signals in response to the baseband signal; assigning a spatial point of origination to each of the N signals; and simultaneously applying each of the N signals to the assigned spatial point of origination to emit from the radiating structure a radio frequency signal having one of M modulation states, where M is greater than N. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of modulating a signal in a radiating structure comprising:
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receiving by a control system an unmodulated carrier and a baseband data signal; splitting by the control system the unmodulated carrier into N signals, wherein N is equal to or greater than 2; adjusting by the control system an amplitude of each of the N signals in response to the baseband signal; assigning by the control system one of N spatial points of origination of the radiating structure to each of the N signals; and simultaneously applying by the control system each of the N signals to the assigned spatial point of origination to emit from the radiating structure a radio frequency signal having one of M modulation states, where M is greater than N. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification